Computes Kinematic Parameters for Swimming R package fishmechr version 1.0.3 Processes tracked points on a fish's body and uses them to estimate standard kinematic parameters such as tail beat amplitude and frequency, body wavelength and wavespeed. As part of this, it also estimates the location of the center of mass and the principal swimming axis. The techniques are described in detail in the main vignette and are published in the book chapter Hawkins, O.H., Di Santo, V., Tytell, Eric.D., 2025. "Biomechanics and energetics of swimming", in: Higham, T.E., Lauder, G.V. (Eds.), Integrative Fish Biomechanics, Fish Physiology. Academic Press. <doi:10.1016/bs.fp.2025.06.003>. Software Depends: R (>= 4.4.0) Imports: assertthat, cli, dplyr, gsignal, pracma, rlang, tibble, tidyr, tidyselect Suggests: ggplot2, knitr, patchwork, rmarkdown, testthat (>= 3.0.0) Eric Tytell <eric.tytell@tufts.edu> Comprehensive R Archive Network (CRAN) Eric Tytell [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-6603-9448>), Olivia Hawkins [ctb] (ORCID: <https://orcid.org/0000-0001-9373-5919>), National Science Foundation [fnd] CC BY 4.0 2026-03-29 application/tgz https://CRAN.R-project.org/package=fishmechr doi:10.32614/CRAN.package.fishmechr